Tube light



FIG. 1 is a front-right-bottom perspective view thereof;

FIG. 2 is a back view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an enlarged front view thereof.

The broken line showing in FIGS. 1, 3-6 and 8 are included for the purpose of Illustrating environmental structures and form no part of the claimed design. 

The ornamental design for a tube light, as shown and described. 